Mass spectrometric apparatus and ion source

Details Mass spectrometric apparatus and ion source Mass spectrometric apparatus and ion source

2007-01-16

2007-01-16

Nguyen, Kiet T. (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S42300F

Reexamination Certificate

active

11009485

ABSTRACT:
A mass spectrometric apparatus capable of generating and detecting positive and negative ions stably at the same time. The apparatus preferably comprises: an opening through which a sample gas is introduced; an ion source to generate ions of the sample gas; and a mass spectrometer to analyze the mass of the generated ions. The ion source utilized with the mass spectrometric device comprises: a first needle electrode on which a voltage is applied in order to generate positive ions of the sample gas introduced through the opening; a first counter electrode having a first opening through which the sample gas and the positive ions pass; a second counter electrode disposed opposite the first counter electrode having a second opening through which the sample gas and the positive ions pass; a second needle electrode on which voltage is applied in order to generate negative ions of the sample gas; and a vent through which the sample gas is ejected. Generated ions are then introduced into a vacuum region via an aperture and subjected to mass analysis.

REFERENCES:
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patent: 6544484 (2003-04-01), Kaufman et al.
patent: 6649907 (2003-11-01), Ebeling et al.
patent: 6686592 (2004-02-01), Sakairi et al.
patent: 6737641 (2004-05-01), Kato
patent: 2001-351569 (2000-06-01), None
patent: 2002-181783 (2000-12-01), None
patent: WO 99/13492 (1998-09-01), None

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